rqt_dotgraph

Provides a ROS2 node and an rqt plugin for visualizing DOT graph files. You can either load a DOT file or subscribe to a ROS2 topic.

To visualize the DOT graphs, this module includes a version of xdot_qt.py forked from ROSPlan and released under LGPLv3. The forked version in this package has been modified and the changes to it are released under the LGPLv3. The rest of this package is released under the CC0 license.

Nodes

rqt_dotgraph

Subscriptions

dot_graph (std_msgs/String)

• String containing the dot graph itself (e.g. the contents of a DOT file).

Parameters

~title (string, default: Dot Graph Viewer)

• Window title.

Troubleshooting

Plugin File Not Found

rqt plugins can have issues running. This has occurred most often after updating graphics drivers. A typical error message is the following.

RosPluginProvider._parse_plugin_xml() plugin file "/home/user/ws/install/rqt_dotgraph/share/rqt_dotgraph/plugin.xml" in package "rqt_dotgraph" not found

The fix is to run the following command then continue with previous commands where the error occurred.

ros2 run rqt_dotgraph rqt_dotgraph --force-discover

Import Errors when Running

When running the node with

ros2 run rqt_dotgraph rqt_dotgraph

and this error occurs

ImportError: cannot import name 'QVariant' from 'PySide2.QtCore' (/home/thomas/src/rqt_dotgraph/venv/lib/python3.10/site-packages/PySide2/QtCore.abi3.so)

Fix it with

pip install PyQt5

If this error occurs

ModuleNotFoundError: No module named 'PySide2'

Fix it with

pip install PySide2